UM1561 datasheet(36/39 Pages) STMICROELECTRONICS

36 / 39 page

Input/output protection

UM1561

36/39

Doc ID 023556 Rev 1

Input/output protection

The power board is also controlled by the microcontroller for the input/output protection.

During normal operation it is possible that the cables (input or output side) are accidentally

disconnected from the panel or from the grid. In this case, overcurrent or overvoltage may

appear at the power stage. To avoid damaging the electronic parts, a procedure is

implemented in the 250WControl.c file, as follows:

if (BusFiltered > 13000)

{

Fault = BUS_OVERVOLTAGE;

GPIO_ResetBits(GPIOA, GPIO_Pin_1);

State_Control = STOP_WITH_DELAY;

Diagnostic_Control=BUS_OVERVOLTAGE;

}

if (BusFiltered < 9880 && MPPT_EN==TRUE)

{

Fault = BUS_UNDERVOLTAGE;

GPIO_ResetBits(GPIOA, GPIO_Pin_1);

State_Control = STOP_WITH_DELAY;

Diagnostic_Control=BUS_UNDERVOLTAGE;

}

where:

●

Fault = BUS_OVERVOLTAGE;

is (Bus overvoltage detected)

●

Fault = BUS_UNDERVOLTAGE;

is (Bus undervoltage detected).

if((qIalpha_Inverter > 19667 || qIalpha_Inverter <-19667) &&

State_Control==GRID_INSERTION && MPPT_EN==TRUE) //1.6 max output peak

current

{

Fault = OUT_CURRENT_LIMIT;

GPIO_ResetBits(GPIOA, GPIO_Pin_1);

State_Control = STOP_WITH_DELAY;

Diagnostic_Control=OUT_CURRENT_LIMIT;

}

where:

●

GPIO_ResetBits(GPIOA, GPIO_Pin_1);

is (AC line overcurrent detected)

●

State_Control = STOP_WITH_DELAY;

is (PV_module Vmin detected).

if(PV_Voltage<=11000 && State_Control==GRID_INSERTION) //22V min

{

GPIO_ResetBits(GPIOA, GPIO_Pin_1);

State_Control = STOP_WITH_DELAY;

Diagnostic_Control=PV_VOLTAGE_MIN;

}

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